cbs 5 reporter elizabeth wenger is in san francisco with the story of a video that has a police sergeant in hot water. >> reporter: it should be interesting to see what happens next. yeah, the biggest question is why? it's pretty astonishing video. it was taken in broad daylight so you think that's the time when typically a lot of cars, a lot of traffic here at the broadway tunnel. and so the driver started here ee here at larkin and gunned it through the tunnel to chinatown. here's the video. [ engine revs ] >> reporter: it was posted on sergeant carl t's facebook page and was first obtained by sfist. it was seen in the broadway tunnel in a matter of seconds. there is no way to identify who was driving but in the comments section of the facebook page, he even bragged, we were all drunk. folks we showed the video to were shocked but others say since there were no other drivers around, no harm no foul. >> is he going to lose his dog in that's very reckless. >> took advantage because he was a cop. >> probably want to do it differently or not at all. >> reporter: we should note the officer